Method

Beat butter, vanilla extract and sugar in a small bowl with an electric mixer until light and fluffy. Beat in eggs, one at a time, until just combined. Stir in flour and milk until smooth; spread mixture into prepared pan. Bake, uncovered, about 25 minutes. Stand cake in pan 5 minutes; turn top-side up , onto wire rack to cool.

Meanwhile, make jelly according to manufacturer's instructions. Refrigerate until set to the consistency of an unbeaten egg white.